Information retrieving apparatus capable of rearranging information stored in memory

Abstract

There is disclosed an information retrieving apparatus with an external memory such as a magnetic disk capable of rearranging information stored in memory. The apparatus is provided with a first memory for storing at least accessing data. A comparator comparts the data from the external memory with the accessing data. A second memory stores the retrieved pertinent i.e., data resulting from a comparison of the accessing data with data retrieved from the external memory. The retrieved pertinent data is supplied as retrieving data to the first memory in synchronization with the data transfer rate of the external memory to enable extraction of plural records from the external memory.

What I claim is: 
     
       1. A retrieving apparatus for retrieving data stored in an external memory, comprising: first memory means for storing accessing data used to retrieve desired data among data stored in said external memory;   means for retrieving data from said external memory;   comparator means connected to said first memory means and said external memory for comparing data retreieved from said external memory with the accessing data stored in said first memory means so as to select, among the retrieved data, pertinent data which has a defined relationship to said accessing data;   second memory means for storing retrieved pertinent data, said second memory means storing the retrieved pertinent data while data to be retrieved from said external memory is retrieved from said external memory; and   means for transferring from said second memory means to said first memory means, as accessing data in said first memory means, data representing said retrieved pertinent data stored in said second memory means, while data to be retrieved from said external memory is retrieved from said external memory.   
     
     
       2. A retrieving apparatus according to claim 1, wherein said second memory means stores a plurality of retrieved pertinent data. 
     
     
       3. A retrieving apparatus according to claim 2, wherein said plurality of retrieved pertinent data stored in said second memory means are selected according to a predetermined priority. 
     
     
       4. A retrieving apparatus according to claim 3, wherein said plurality of retrieved pertinent data are arranged in order according to a predetermineed priority. 
     
     
       5. A retrieving apparatus according to claim 1, wherein said comparator means comprises a plurality of comparator circuits connected to compare respective pairs of data from said first memory means and said external memory. 
     
     
       6. A retrieval apparatus according to claim 1, further comprising means for replacing the contents of said first memory means with those of said second memory means. 
     
     
       7. A retrieving apparatus for retrieving data stored in an external memory, comprising: first memory means for storing accessing data used to retrieve desired data among data stored in said external memory;   comparator means for comparing data retrieved from said external memory with the accessing data stored in said first memory means so as to select, among the retrieved data, pertinent data which has a defined relationship to said accessing data;   second memory means for storing retrieved pertinent data, said second memory means storing the retrieved pertinent data output from said comparator means while said comparator means compares data retrieved from said external memory with the accessing data;   address memory means for storing an address at which at least one of said retrieved pertinent data is stored in said second memory means;   means connected to said address memory means for storing, in said address memory means, the address of said at least one retrieved pertinent data stored in said second memory means in synchronization with a data transfer rate at which data is retrieved from said external memory; and   means connected to said address memory means for supplying, as accessing data for comparison by said comparator means, the at least one retrieved pertinent data corresponding to said address stored in said address memory means, while said comparator means compares data retrieved from said external memory with the accessing data.   
     
     
       8. A retrieving apparatus according to claim 7, wherein said second memory means stores a plurality of retrieved pertinent data. 
     
     
       9. A retrieving apparatus according to claim 8, wherein said plurality of retrieved pertinent data stored in said second memory means are selected according to a predetermined priority. 
     
     
       10. A retrieving apparatus according to claim 9, wherein said plurality of retrieved pertinent data are arranged in order according to a predetermined priority. 
     
     
       11. A retrieving apparatus according to claim 7, wherein said comparator means comprises a plurality of comparator circuits connected to compare respective pairs of data from said first memory means and said external memory. 
     
     
       12. A retrieving apparatus for retrieving data stored in an external memory, comprising: means for retrieving data from said external memory;   first memory means for storing data retrieved from said external memory;   second memory means for storing at least accessing data used to retrieve desired data among data stored in said external memory;   address memory means for storing an address at which at least one of said data stored in said second memory means is stored in said second memory means;   comparator means for comparing the contents of said first and second memory means;   comparing condition memory means for effecting a comparing condition operation in said comparator means; and   transfer means for transferring the contents of said first memory means to said second memory means on the basis of a result of comparison by said comparator means.